Movements of the mid-latitude ionospheric trough

Details Movements of the mid-latitude ionospheric trough Movements of the mid-latitude ionospheric trough

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..985r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Nov. 1982, p. 985-992.

Physics

18

F Region, Ionospheric Electron Density, Midlatitude Atmosphere, Space Plasmas, Ionograms, Plasmapause, Polar Regions, Troughs

Scientific paper

The mid-latitude trough, often called the main trough, is defined to be the circumpolar region at about L=4 where the night-time electron concentration of the F-layer is anomalously low. It can be considered as the boundary region between the mid-latitude and the polar ionospheres. A description is provided of a method by which an ionosonde, normally operating at vertical incidence, can be used to monitor the movements of the poleward edge of the mid-latitude trough in electron concentration. It is pointed out that the considered method could be applied to any ionospheric feature where steep gradients in electron concentrations exist, for example in the vicinity of the polar cusp. The observed movements of the poleward edge of the trough are compared with some theoretical models and observations of the plasmapause. Of these only the Kavanagh et al. (1968) model shows good agreement over an extended period and particularly after local midnight.

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